The centre-back is at a loss to explain Saturday's heavy 3-0 loss to fellow strugglers Crystal Palace, and admits the club's final five games of the season are akin to "cup finals"Steven Caulker admits Cardiff City have a "mountain to climb" to avoid the drop and apologised to supporters for the loss to Crystal Palace.
Ole Gunnar Solskjaer's charges have won just once in their last nine league matches, and are six points adrift of safety with just five games remaining, following Saturday's comprehensive 3-0 loss to Crystal Palace.
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"It's difficult to explain it," he told reporters. "I don't know what went wrong.
"It was not for a lack of trying because the boys ran their socks off. But we are going to have to dig deep and show a lot more fight and passion.
"We apologise to the fans that turned up and gave us great support as always. We were very disappointed with it. We know we can perform a lot better than that.
"We've given ourselves a mountain to climb now. It's going to be five cup finals between now and the end of the season.
"It's still mathematically possible we can stay up, so we are not going to write ourselves off.
"We've got confidence from how we played at the start of the season and we've got to get back into some kind of form."